def test_latitude_varying_res(self):
self.assertEqual(0, qc.lat_to_yindex(89.9, 0.25))
self.assertEqual(0, qc.lat_to_yindex(89.9, 0.5))
self.assertEqual(0, qc.lat_to_yindex(89.9, 1.0))
self.assertEqual(0, qc.lat_to_yindex(89.9, 2.0))
self.assertEqual(0, qc.lat_to_yindex(89.9, 5.0))
self.assertEqual(719, qc.lat_to_yindex(-89.9, 0.25))
self.assertEqual(359, qc.lat_to_yindex(-89.9, 0.5))
self.assertEqual(179, qc.lat_to_yindex(-89.9, 1.0))
self.assertEqual(89, qc.lat_to_yindex(-89.9, 2.0))
self.assertEqual(35, qc.lat_to_yindex(-89.9, 5.0))
def get_value(self, lat, lon, month, day):
'''
Get the value from the climatology at the give position and time
:param lat: latitude of location to extract value from in degrees
:param lon: longitude of location to extract value from in degrees
:param month: month for which the value is required
:param day: day for which the value is required
:type lat: float
:type lon: float
:type month: integer
:type day: integer
:return: climatology value at specified location and time.
:rtype: float
'''
if month < 1 or month > 12:
return None
ml = qc.month_lengths(2004)
if day < 1 or day > ml[month - 1]:
return None
yindex = qc.lat_to_yindex(lat, self.res)
xindex = qc.lon_to_xindex(lon, self.res)
tindex = self.get_tindex(month, day)
result = self.field[tindex, yindex, xindex]
if type(result) is np.float64 or type(result) is np.float32:
pass
else:
if result.mask:
result = None
else:
result = result.data[0]
return result
def __init__(self, lat, lon, year, month=None, day=None):
'''
Make a :class:`.Gridpt` object from lat, lon, year, month and day
:param lat: latitude of the observation
:param lon: longitude of observation
:param year: year of the observation
:param month: month of the observation
:param day: day of the observation
:type lat: float
:type lon: float
:type year: integer
:type month: integer
:type day: integer
'''
self.lat = lat
self.lon = lon
self.year = year
self.month = month
self.day = day
if month == None:
self.ptd = year
else:
self.ptd = qc.which_pentad(month, day)
self.xindex = qc.lon_to_xindex(lon)
self.yindex = qc.lat_to_yindex(lat)
self.latitude_approx = 89.5 - self.yindex
self.longitude_approx = -179.5 + self.xindex
self.idstring = '%(lat)04d%(lon)04d%(ptd)04d' % {"lat": self.yindex,
"lon": self.xindex,
"ptd": self.ptd }
def test_some_points(self):
self.assertEqual(9, qc.lat_to_yindex(87.52, 0.25))
self.assertEqual(18, qc.lat_to_yindex(-2.5, 5))
def test_gridcentres(self):
for i in range(0, 180):
self.assertEqual(i, qc.lat_to_yindex(90 - i - 0.5))
def test_borderline(self):
for i in range(0, 180):
self.assertEqual(i, qc.lat_to_yindex(90 - i))
def test_latitude_too_low(self):
self.assertEqual(179, qc.lat_to_yindex(-199.3))
def test_borderline37(self):
self.assertEqual(53, qc.lat_to_yindex(37.00))
self.assertEqual(11, qc.lat_to_yindex(35.00, 5))
def test_latitude_too_high(self):
self.assertEqual(0, qc.lat_to_yindex(99.2))